Whole Wheat Irish Soda Bread

Preheat oven to 400 degrees F and line a baking sheet with parchment paper. In a large mixing bowl, combine whole wheat flour, all purpose flour, baking soda, salt, and raisins. Make a well in the center of the dry ingredients and buttermilk all at once. Fold the ingredients with a rubber spatula until just combined; do not overmix. Turn dough out onto the parchment paper and form into a round loaf. Cut an X into the top of the dough with a sharp knife about ½ inch deep. Place on the middle rack to bake for 30 min or until firm and golden brown.